Just for the record, a QA-42A will fit either a NF or WF tractor, the "A" means adjustable. The frame brackets can be expanded or contracted as needed.
As for tractors of choice, a 149 is more than enough tractor for clearing snow, and also is more serviceable than a 169. There's nothing wrong with a 169, but they are a rarer machine and have some model-specific parts that can be very difficult/expensive to find, particularly the engine block itself were something to go wrong. Also, as others have said, a tractor from Zippy's stable is likely good as or better than new, just read any thread of his to see the care that goes into his machines.
I've done all my yard chores the last 6 years with my 125, and I can't speak highly enough of the 12+hp/hydrostatic combo. Speed control is excellent, there's never a shortage of power for any task, and with quick-attach implements its very easy to switch between jobs. If you keep your eyes out for a 125, 127, 147, 129, or 149, you won't be disappointed. The 149 would also meet all your requirements best. Good luck in your search!
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Ian
Mine: 72 w/ k301, 3 125's, 1 w/ hydro lift, 38,42, & 2 48 decks, 2 42 front blades, QA-36a & QA-42a thrower, tiller, lo-boy 154. Also, LOTS of parts.
family's:2 105's, 2 106's, 149, 2 lo-boy 154s, Farmall Cub.
Non-IH: 1940 JD Model A, 1954 JD 40 U, 1955 JD 40 Crawler, 2 1956 JD 420 U's, both w/ Henry Loader and Backhoe. JD 110. Wheel Horse (model unknown.) Power King 1614. We love our tractors! 
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